PROTHENA CORP PUBLIC LTD CO

PRTANASDAQ

$8.27-0.09 (-1.08% today)

Legend

Insider buy

Insider sell

Congress buy

Congress sell

Hedge Funds
bought vs soldGreener markers show more buyers; redder markers show more sellers.

Company share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size.

Insider buy
Insider sell
Congress buy
Congress sell
Hedge Funds bought vs sold

Share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size. Greener fund markers mean more buyers.

Insider Buy
Insider Sell
Congress Buy
Congress Sell
Hedge funds bought vs sold
BuybackNo changeNet dilution

PROTHENA CORP PUBLIC LTD CO price and activity chart data

Showing the 1Y range: Oct 6, 2025 to Oct 5, 2026. Price (-16.1%). 0 insider or congressional trades plotted in this window as 0 markers; nearby trades of the same kind are grouped.

Transactions plotted on the price chart
Date	Category	Person	Role	Action	Amount	Change in holding

Largest institutional holders

13F · Q2 2026

Fund	% of company held	Value	% of portfolio	Quarterly activity
FMR LLC	13.91%	$70.5M	0.00%	Not reported
Rubric Capital Management LP	9.66%	$49M	0.45%	Not reported
BlackRock, Inc.	9.41%	$47.7M	0.00%	Not reported
State Street Corp	4.63%	$23.4M	0.00%	Not reported
Acadian Asset Management LLC	3.89%	$19.7M	0.02%	Not reported
Vanguard Portfolio Management LLC	3.19%	$16.2M	0.00%	Not reported
D. E. Shaw & Co., Inc.	3.11%	$15.8M	0.01%	Not reported
ADAR1 Capital Management, LLC	3.00%	$15.2M	0.70%	Reduce 1.70%
Two Sigma Investments, LP	2.44%	$12.4M	0.01%	Not reported
Palo Alto Investors LP	2.21%	$11.2M	1.55%	Reduce 5.41%
Geode Capital Management, LLC	2.18%	$11M	0.00%	Not reported
Federated Hermes, Inc.	2.10%	$10.6M	0.02%	Not reported
Morgan Stanley	1.92%	$9.74M	0.00%	Not reported
Goldman Sachs Group Inc	1.89%	$9.59M	0.00%	Not reported
Jacobs Levy Equity Management, Inc	1.87%	$9.46M	0.03%	Not reported
Dimensional Fund Advisors LP	1.75%	$8.87M	0.00%	Not reported
Qube Research & Technologies Ltd	1.53%	$7.75M	0.01%	Not reported
Renaissance Technologies LLC	1.35%	$6.83M	0.01%	Not reported
Man Group plc	1.31%	$6.64M	0.01%	Not reported
Mariner, LLC	1.21%	$6.12M	0.01%	Not reported
Nuveen, LLC	1.08%	$5.45M	0.00%	Not reported
Vanguard Capital Management LLC	0.93%	$4.7M	0.00%	Not reported
Northern Trust Corp	0.88%	$4.48M	0.00%	Not reported
Birchview Capital, LP	0.87%	$4.4M	2.06%	Not reported
Rangeley Capital, LLC	0.81%	$4.09M	3.73%	Not reported
Charles Schwab Investment Management Inc	0.69%	$3.48M	0.00%	Not reported
Citadel Advisors LLC	0.65%	$3.32M	0.00%	Not reported
Monimus Capital Management, LP	0.64%	$3.22M	0.75%	Reduce 32.24%
BNP Paribas Financial Markets	0.61%	$3.09M	0.00%	Not reported
AQR Capital Management LLC	0.58%	$2.96M	0.00%	Not reported
Penbrook Management LLC	0.53%	$2.66M	1.70%	Not reported
Vanguard Fiduciary Trust Co	0.50%	$2.54M	0.00%	Not reported
UBS Group AG	0.47%	$2.36M	0.00%	Not reported
Mackenzie Financial Corp	0.46%	$2.35M	0.00%	Not reported
Squarepoint Ops LLC	0.43%	$2.19M	0.00%	Not reported
Bank of America Corp	0.40%	$2.04M	0.00%	Not reported
Focused Wealth Management, Inc	0.40%	$2.03M	0.18%	Add 0.02%
Marshall Wace, LLP	0.37%	$1.87M	0.00%	Not reported
Quantinno Capital Management LP	0.31%	$1.55M	0.00%	Add 9.72%
Diadema Partners LP	0.29%	$1.46M	0.18%	New Not reported
Bank of New York Mellon Corp	0.26%	$1.31M	0.00%	Not reported
Massachusetts Financial Services Co	0.25%	$1.24M	0.00%	Reduce 3.83%
Assenagon Asset Management S.A.	0.24%	$1.23M	0.00%	Not reported
Russell Investments Group, Ltd.	0.24%	$1.19M	0.00%	Not reported
Hennion & Walsh Asset Management, Inc.	0.18%	$889K	0.03%	Add 2.54%
American Century Companies Inc	0.18%	$887K	0.00%	Not reported
Ameriprise Financial Inc	0.17%	$854K	0.00%	Not reported
XTX Topco Ltd	0.17%	$839K	0.01%	Not reported
Susquehanna Portfolio Strategies, LLC	0.16%	$810K	0.01%	Add 21.87%
ExodusPoint Capital Management, LP	0.16%	$803K	0.01%	Not reported

50 of 179 holders

Activity score

Premium

100

WEAK

STRONG

Unlock

AI Activity Analysis

Premium

Coming soonAI reads of insider, institutional and company activity will appear here for Premium accounts.

Historical Activity Patterns

Premium

Historical Activity PatternsHistorical periods where multiple activity categories converged, with subsequent market performance shown for context.Unlock